Glossary

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Is there a word you don't understand?

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**biodegradable** - to have the ability to **biodegrade** **biodegrade** - to decay and become a natural part of the environment **celluloid** - a strong, hard plastic **conductors of electricity** - to serve as a channel or medium for heat or electricity **crude oil** - a thick black liquid found under the ground or the sea **dense** - having the parts closely compacted together, often making the object heavier; crowded and compacted **density** - the state or quality of being **dense** **durable** - to be able to resist weakness or decay; long-lasting and endurable **environmentally friendly** - if something is environmentally friendly it means that it has a minimal impact on the natural environment (Also called nature-friendly) **fractional distillation** - the separation of elements (by boiling until a rapid evaporation occurs) of different boiling points in a mixture by gradually increasing temperature, and the separate collection of each element ** granules ** - a small grain **ivory** - a hard white substance often made from an elephant's or walrus's tusks **jute** - a tall plant with strong stringy fibres used for bags, ropes, sacks and carpet backs **non-renewable** - an energy source such as oil or natural gasses or a natural source that cannot be reused if used once already **opaque** - not transparent or translucent; an object that does not allow light to pass through **rigid** - stiff or inflexible
 * compressed ** - pressed to take up less space; condensed
 * depot ** - a storage where materials and supplies are kept for distribution
 * fibres ** - fine strands or threads
 * mould **  - a form or matrix which gives a particular shape to something, such as plastic